#include "pwm.h"

/*******************************************************************************
* 函 数 名         : TIM3_CH2_PWM_Init
* 函数功能           : TIM3通道2 PWM初始化函数
* 输    入         : per:重装载值
                                psc:分频系数
* 输    出         : 无
*******************************************************************************/
void TIM3_CH2_PWM_Init(u16 per, u16 psc)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    /* 开启时钟 */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

    /*  配置GPIO的模式和IO口 */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //复用推挽输出
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE);  //改变指定管脚的映射

    TIM_TimeBaseInitStructure.TIM_Period = per;     //自动装载值
    TIM_TimeBaseInitStructure.TIM_Prescaler = psc;  //分频系数
    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;  //设置向上计数模式
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OC2Init(TIM3, &TIM_OCInitStructure);  //输出比较通道2初始化

    TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  //使能TIMx在 CCR2 上的预装载寄存器
    TIM_ARRPreloadConfig(TIM3, ENABLE);                //使能预装载寄存器

    TIM_Cmd(TIM3, ENABLE);  //使能定时器
}

void TIM2_CH1_PWM_Init(u16 per, u16 psc)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);   // 定时器RCC
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  //使能GPIO外设时钟使能

    //设置该引脚为复用输出功能,输出TIM1 CH1 CH4的PWM脉冲波形
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_11;  //TIM_CH1 //TIM_CH4
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;          //复用推挽输出
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    TIM_TimeBaseStructure.TIM_Period = per;                      //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
    TIM_TimeBaseStructure.TIM_Prescaler = psc;                   //设置用来作为TIMx时钟频率除数的预分频值  不分频
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;                 //设置时钟分割:TDTS = Tck_tim
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //TIM向上计数模式
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);              //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位

    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;              //选择定时器模式:TIM脉冲宽度调制模式1
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  //比较输出使能
    TIM_OCInitStructure.TIM_Pulse = 0;                             //设置待装入捕获比较寄存器的脉冲值
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;      //输出极性:TIM输出比较极性高
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);                       //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
    TIM_OC4Init(TIM1, &TIM_OCInitStructure);                       //根据TIM_OCInitStruct中指定的参数初始化外设TIMx

    TIM_CtrlPWMOutputs(TIM1, ENABLE);  //MOE 主输出使能

    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH1预装载使能
    TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);  //CH4预装载使能

    TIM_ARRPreloadConfig(TIM1, ENABLE);  //使能TIMx在ARR上的预装载寄存器

    TIM_Cmd(TIM1, ENABLE);  //使能TIM1
}
